HDDS-15312. Improve VolumeInfoMetrics to include MinFreeSpace and Non-Ozone used space

[priyeshkaratha]

What changes were proposed in this pull request?

Min Free Space and Non-Ozone Used Space metrics are not available in JMX. Also, Total Capacity and Filesystem Capacity represent the same value, so there is no need to expose both fields separately. Therefore, we are removing the Total Capacity field and added Min Free Space and Non-Ozone Used Space metrics.

What is the link to the Apache JIRA

HDDS-15312

How was this patch tested?

Updated unit testcase.
Also tested manually

bash-5.1$ curl -XGET http://ozone-datanode-1:9882/jmx?qry=Hadoop:service=HddsDatanode,name=VolumeInfoMetrics-/data/hdds
{
  "beans" : [ {
    "name" : "Hadoop:service=HddsDatanode,name=VolumeInfoMetrics-/data/hdds",
    "modelerType" : "VolumeInfoMetrics-/data/hdds",
    "tag.Context" : "ozone",
    "tag.StorageType" : "DISK",
    "tag.DatanodeUuid" : "2ee1eb0b-1929-4108-962c-0507cdd19da3",
    "tag.VolumeType" : "DATA_VOLUME",
    "tag.StorageDirectory" : "/data/hdds/hdds",
    "tag.VolumeState" : "NORMAL",
    "tag.Hostname" : "67088f32a63b",
    "AvailableSpaceInsufficient" : 0,
    "DbCompactLatencyNumOps" : 0,
    "DbCompactLatencyAvgTime" : 0.0,
    "NumContainerCreateRequestsInSoftBandMinFreeSpace" : 0,
    "NumContainerCreateRequestsRejectedHardMinFreeSpace" : 0,
    "NumScans" : 1,
    "NumScansSkipped" : 0,
    "NumWriteRequestsInSoftBandMinFreeSpace" : 0,
    "NumWriteRequestsRejectedHardMinFreeSpace" : 0,
    "ReservedCrossesLimit" : 1,
    "Committed" : 0,
    "LayoutVersion" : 1,
    "Containers" : 0,
    "OzoneCapacity" : 105076655700,
    "OzoneAvailable" : 88516947968,
    "OzoneUsed" : 4382720,
    "Reserved" : 10508716,
    "FilesystemCapacity" : 105087164416,
    "FilesystemAvailable" : 88516947968,
    "FilesystemUsed" : 4382720,
    "MinFreeSpace" : 104857600,
    "NonOzoneUsed" : 16565833728
  } ]
}